Adding-machine.



PATENTED DEC. 6, 1904.

No. 776,582. f

F. T. BETTS. ADDING MACHINE.

APPLICATION FILED AUG. 1l 1904.

2 SHEETS-SHEET 1.

No MODEL.

nvntor.

nesses l b A f 9 f/ f f y ttornegs No. 776,582. Y PATENTED DEG. 6, 1904.I'. TVBBTTS.

ADDING MACHINE.

APPLIUATION FILED AUG. 1, 1904. H0 MODEL. 2 SHEETS-SHEET 2.

- MMT Witnesse I `Inventor.

l l l f I I ttornegs Patented December 6, 1904.

PATENT OEEICE.

FRANKLIN T. BETTS, OF DEFIANOE, OHIO.

ADDINGHNIACHINE.A

SPECIFICATION forming part of Letters Patent N o. 776,582, datedDecember 6, 1904. Application filed August l, 1904. Serial No. 219,109.(No model.)

To 0H w/wm t may concern:

Be it known that I, FRANKLIN T. BE'rrs, a citizen of the United States,residing at Defiance, in the county of Defiance and State of Ohio, haveinvented a new and useful Adding- Machine, of which the following is aspecification.

This invention relates to certain improvements in addingmachines of thatgeneral class shown and described in United States Letters Patentgranted to Stephen N. Betts on the 7th day of April, 1903, under No.724,424.

The primary object of the invention is to improve, simplify, and'cheapenthe construction of the machine and to render the latter more accurateby providing means for preventing backward movement of thecomputing-wheel'wh en performing mathematical calculations.

A further object of the invention is to provide a sheet-metal frameformed in twosections, one of which is provided with a plurality ofradiating ribs and the other with an opening for the computing-wheel,said wheel being mounted for rotation on an intermediatereinforcing-plate lprovided with corresponding radiating ribs adapted toengage the ribs on the lower section of the frame, so that said platewill be retained in position without the use of screws, rivets, andsimilar fastening devices.

The invention consists in the construction and novel combination andarrangement of parts hereinafter fully described, illustrated in thedrawings, and pointed out in the claims hereto appended, it beingunderstood that various changes in form, proportion, and minor detailsof construction may be resorted to without departing from the principleor sacrilicing any of the advantages of this invention.

In the accompanying drawings, forming a part of this specification,Figure 1 is a front elevation of an adding-machine constructed inaccordance with my invention. Fig. 2 is a similar view with the topsection of the frame removed. Fig. 3 is a transverse sectional viewtaken on the line 3 3 of Fig'. 2 with the parts assembled. Fig. 4 is anenlarged detail sectional view showing the arrangement ofreinforcing-plates and spring-pawls. is a detail view of one of thepawls.

Similar numerals of reference indicate corresponding parts inv all thefigures of the drawings.

The device consists of a boX or casing 5, preferably rectangular inshape, as shown, and stamped from sheet metal or other suitablematerial, said casing being preferably formed in two sections 6 and 7spaced apart by a vertical strip 8 and having their overlapping edgesbent inwardly and detachably secured together by a clamping-band 9.Rigidly secured between the sections 6 and '7 of the casing, as byscrews 10 and 10, is a centrally-disposed hub or barrel 11, upon whichis mounted for rotation the computing-wheel 12, said wheel beingpreferably stamped from a Ysingle piece of metal and formed with adepending rib o1' bead 13 and a series of peripheral teeth 14. The wheel12 is provided with an annular row of perforations 15, corresponding innumber to the teeth 14, and stamped or otherwise imprinted on said wheelopposite the perforations are a scale of numbers ranging, preferably,from 0 to 99, as shown. The wheel 12 normally closes an opening in theupper section of the casing and around which are arranged at uniformdistances a series of numerals ranging in like manner from O 7 to 99,said wheel being traversed by a pointer 16, pivotally mounted on the hubor barrel 11.

The numerals on the casing and computingwheel are so arranged withrelation to each other that when the computing-wheel is operated byinserting the depending lug 17 of the pointer in the perforationopposite the numeral 50 and turning said wheel until the pointer engagesa stop 18 on the casing O will appear at an opening 18 in the casing andthe device will be set for operation. Mounted for rotation on the uppersection of the casing is a registering or hundreds disk 19, providedwith a peripheral series of teeth or spurs 2O for successive engagementby an upwardly-extending spur or lip 21 on the periphery of theunits-disk or computing-wheel 14, said registering-disk being' held frombackward movement by a dog 22, pivoted to the Fig. 5

IOO

casing, as shown. The lower section 7 of the casing is stamped orotherwise formed with a series of radiating ribs or depressions 23, twoof which are shown in cross-section and two in full lines in Fig. 3 ofthe drawings, and supported on said section is an intermediatereinforcingplate 24, provided with corresponding ribs or depressions 25,which engage the ribs 23 and retain said plate in position without theemployment of screws, rivets, or similar auxiliary fastening devices.The plate Q4 is provided with an u pstruck annular flange 26, a portionof which is cut away, as indicated at 27, to accommodate theregisteringwheel 19. Pivoted to the iiange 26 are a pair ofoppositely-disposed spring-pawls 28, which pass through openings- 29 insaid flange and engage the teeth on the computing-wheel 14. The distancebetween the end of the lip 21 and the adjacent tooth on the wheel 12 isequal to the distance between two of the teeth on said wheel, and theobject of the pawls 28 is to prevent the wheel from turning more thanthe distance of one tooth in either direction when the lip is oppositeeither pawl.

To set the machine, turn the registeringdisk until the numeral 24Cappears in the opening 30, and then insert the pointer in theperforation opposite the mark 8l and turn said wheel until the pointerengages the stop 18, which operation will cause O to appear at bothopenings in the casing.

ln adding two or more columns the pointer is inserted in the perforationopposite the number on the casing to be added and said wheel turneduntil the pointer engages the stop, after which said pointer is removedand inserted in the perforation corresponding to the next number to beadded, the total appearing at the openings in the casing after eachoperation, as will be readily understood.

The plate 24 not only reinforces the casing, but also forms a supportfor the pivoted pawls and acts as a guide or wear-plate for thedepending rib of the computing-wheel, while said plate and casing beingprovided with interlocking parts the use of auxiliary fastening' devicesis entirely dispensed with.

The device is extremely simple in construction and being' formedentirely of sheet metal will withstand very rough usage and may bemanufactured at a small cost.

Having thus described the invention, what is claimed is- 1. 1n a deviceof the class described, a easing, a toothed computingwheel rotatablymounted therein, a reinforcing-plate locked in position by engagementwith the easing, and provided with an annular iiange having oppositelydisposed openings formed therein, pawls pivoted to said flange andextending through the openings for engagement with the teeth on thecomputing-wheel, and means for rotating said wheel.

2. In a device of the class described, a casing provided with aplurality of ribs or depressions, a toothed computing-wheel providedwith a depending bead rotatably mounted in said casing, an intermediatereinforcingplate engaging said bead and provided with a plurality ofcorresponding ribs or depressions adapted to receive the ribs on thecasing, a pawl carried by the plate and adapted to engage the teeth onthe computing-wheel, and means for rotating said wheel.

3. 1n a device of the class described, a casing formed in two sections,one of which is provided with a plurality of ribs or depressions, atoothed computing-wheel mounted for rotation in said casing, anintermediate reinforcing-plate provided with corresponding ribs ordepressions adapted to engage the ribs on the casing, a pawl carried bythe plate and adapted to engage the teeth on the computing-wheel, meansfor rotating the wheel, and means for securing the two sections of thecasing together.

4L. In a device of the class described, a easing provided with aplurality of depending ribs 01 depressions, a toothed computingwheelmounted for rotation in said casing, an intermediate reinforcing-plateprovided with corresponding ribs or depressions adapted to engage theribs on the easing, a flange formedv integral with the plate andprovided with oppositely-disposed openings, pawls pivoted to the fiangesand extending through said openings for engagement with the teeth of thecomputing-wheel, and means for rotating said wheel.

5. In a device of the class described, a casing formed in two sectionsthe lower one of which is provided with a plurality of ribs ordepressions, a toothed computing wheel mounted for rotation in saidcasing, an intermediate reinforcing-plate provided with correspondingribs adapted to engage the ribs on the lower section of the casing, aiiange formed integral with the plate and adapted to engage the uppersection of the casing, oppositelydisposed openings formed in saidiiange, pawls pivoted to the flange and extending through said openingsfor engagement with the teeth on the computing-wheel, means for rotatingthe wheel, and means for clamping the two sections of the casingtogether.

6. VIn a device of the class described, a casing comprising a pair ofspaced sections one of which is provided with a plurality of ribs ordepressions, a toothed computing-wheel provided with a depending' beadmounted for rotation in said casing, an intermediate reinforcing-plateengaging' the bead on the computing-wheel and provided withcorresponding ribs or depressions fitting within the ribs on the casing,a liange formed on said plate and engaging the upper section of thecasing, oppositely-disposed openings formed in said flange,spring-pressed pawls pivoted to the flange and extending through saidopenings IOO IIS

forcing-plate and engaging the upper 'plate of the casing, openingsformed in said flange, pawls pivoted to the 'flange and extending'through said openings for engagement with the teeth on thecomputing-Wheel, and a lever fulerumed on the hub 'for rotating saidwheel. In testimony that I claim the foregoing' as my own I have heretoaffixed my signature in the presence of two Witnesses.

FRANKLIN T. BETTS. l/Vitnesses:

GRACE L. BAILEY, K. V. HAYMAKER.

